public class test {
    //使用递归实现1+2+3...+10
    public static int sum(int n){
        if(n==1) {
            return 1;
        }
        else {
            return n+sum(n-1);
        }
    }
    public static void main(String[] args) {
        System.out.println(sum(10));
    }
}
